利用聚类技术探测全球海洋上的相干温盐结构

IF 2.3 3区 地球科学 Q2 OCEANOGRAPHY
Emmanuel Romero , Esther Portela , Leonardo Tenorio-Fernandez , Laura Sánchez-Velasco
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引用次数: 0

摘要

将海洋划分为具有相似物理和/或生物地球化学特征的水团,为有效监测海洋特性的变化提供了理想的框架。特别是,海水温度和盐度的组合设定了水柱的分层,影响了海洋环流,对气候信号从海面到内部的传播具有重要影响。本研究的目的是在全球海洋的不同区域寻找空间上一致的温盐结构,以及它们与区域动力学的联系。为此,我们采用聚类技术,在全球海洋的不同空间尺度上识别由相干热盐结构划分的水团。我们对整个海洋的保守温度和绝对盐度剖面采用了 K-均值的聚类技术,K 值范围很广。我们的分析揭示了主要海洋动力结构(如洋锋、洋流或环流迟缓区域)对垂直温盐分量的影响。我们介绍了三个研究案例,即加利福尼亚洋流系统、南大洋和东热带纬度,在这些案例中,我们可以确定具有共同温盐特征的区域(尽管来自不同的大洋盆地),并确定季节变化和异常剖面。这种方法可以降低水柱的维度,并根据其垂直热盐结构确定区域界限,而不是更僵化的、并非总是合适的地理边界。这对于监测和预测快速变化的气候背景下的海洋变化具有重要的潜在应用价值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Detection of coherent thermohaline structures over the global ocean using clustering

Detection of coherent thermohaline structures over the global ocean using clustering

The classification of the ocean in water masses with similar physical and/or biogeochemical characteristics provides an ideal framework for an efficient monitoring of the change in ocean properties. Particularly, the combination of the seawater temperature and salinity set the stratification of the water column and impacts ocean circulation, with important implications for the surface-to-interior propagation of climate signals. The objective of this study is to find spatially coherent thermohaline structures in different regions of the global ocean, as well as their link with regional dynamics. To this end, we apply clustering techniques to identify water masses delimited by coherent thermohaline structures at different spatial scales over the global ocean. The clustering technique known as K-mean was used with a wide range of k values for conservative temperature and absolute salinity profiles of the entire ocean. Our analysis revealed the impact of the main dynamical oceanic structures (such as ocean fronts, currents, or regions of sluggish circulation) on the vertical thermohaline component. We present three cases of study, the California Current System, the Southern Ocean, and the Eastern Tropical Latitudes, where we could identify regions with common thermohaline characteristics (despite being from different ocean basins), as well as to identify seasonal changes and anomalous profiles. This method makes it possible to reduce the dimensionality of the water column, and allows for the establishment of regional limits driven by their vertical thermohaline structure instead of more rigid, and not always appropriate geographical borders. This has potential important applications for the monitoring and prediction of ocean variability in the context of a rapidly changing climate.

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来源期刊
CiteScore
4.60
自引率
4.20%
发文量
144
审稿时长
18.3 weeks
期刊介绍: Deep-Sea Research Part I: Oceanographic Research Papers is devoted to the publication of the results of original scientific research, including theoretical work of evident oceanographic applicability; and the solution of instrumental or methodological problems with evidence of successful use. The journal is distinguished by its interdisciplinary nature and its breadth, covering the geological, physical, chemical and biological aspects of the ocean and its boundaries with the sea floor and the atmosphere. In addition to regular "Research Papers" and "Instruments and Methods" papers, briefer communications may be published as "Notes". Supplemental matter, such as extensive data tables or graphs and multimedia content, may be published as electronic appendices.
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